1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection.Metadata;
using Internal.Text;
using Internal.TypeSystem;
using Internal.TypeSystem.TypesDebugInfo;
namespace ILCompiler.DependencyAnalysis
{
internal class WindowsDebugTypeSignatureMapSection : ObjectNode, ISymbolDefinitionNode
{
UserDefinedTypeDescriptor _userDefinedTypeDescriptor;
public WindowsDebugTypeSignatureMapSection(UserDefinedTypeDescriptor userDefinedTypeDescriptor)
{
_userDefinedTypeDescriptor = userDefinedTypeDescriptor;
}
private ObjectNodeSection _section = new ObjectNodeSection(".dbgtypesignaturemap", SectionType.ReadOnly);
public override ObjectNodeSection Section => _section;
public override bool IsShareable => false;
public override bool StaticDependenciesAreComputed => true;
public int Offset => 0;
protected internal override int Phase => (int)ObjectNodePhase.Ordered;
public override int ClassCode => (int)ObjectNodeOrder.WindowsDebugTypeSignatureMapSectionNode;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(GetName(null));
}
// returns the DEBUG_S_TYPE_MDTOKEN_MAP subsection as a byte array
// DEBUG_S_TYPE_MDTOKEN_MAP subsection contains type-index to mdToken mapping
//
// contents of subsection:
// offset 0, 4 bytes: count of entries in the map
// offset 4, 8*N bytes: 4 byte type-index + 4 byte 'offset' relative to the start of 'type data'
// offset 4+8*N, * bytes: ECMA formatted type signature packed sequentially with no padding
//
// 'offset' optimization: for type signatures with size<= 4-bytes
// we can store the signature in offset field such that
// offset = (1 << 31) | (sig[0] << 24 | sig[1] << 16 | sig[2] << 8 | sig[3])
// We chose this bit encoding because sig[0] holds the CorElementType whose
// highest bit is always 0 and the highest bit of offset can be used as a flag
// to indicate that it is not an offset but the signature itself.
//
// all entries are sorted by 'offset' field and so offset-based entries are arranged before other
// (raw-signature) entries (since raw-signature entries are of the form 0x80000000 | signature, and will always be
// numerically bigger than the offset)
//
private DebugInfoBlob GetDebugTypeIndexToTokenMap(ManagedBinaryEmitter pseudoAssembly, ICollection<KeyValuePair<TypeDesc, uint>> completeKnownTypes)
{
DebugInfoBlob typeDataBlob = new DebugInfoBlob();
DebugInfoBlob typeIndexToTokenMapBlob = new DebugInfoBlob();
List<KeyValuePair<uint, uint>> sigInOffsetEntries = new List<KeyValuePair<uint, uint>>();
typeIndexToTokenMapBlob.WriteDWORD(checked((uint)completeKnownTypes.Count));
BlobBuilder blobBuilder = new BlobBuilder();
foreach (var entry in completeKnownTypes)
{
uint typeIndex = entry.Value;
blobBuilder.Clear();
pseudoAssembly.EncodeSignatureForType(entry.Key, blobBuilder);
// if signature fits in 4-bytes, store it in sigInOffsetEntries
// otherwise store it in the type-data blob
if (blobBuilder.Count <= 4)
{
uint sigInOffset = 0x80000000;
int i = 0;
// This is a slightly confusing approach, but this is how one iterates through the bytes in a blobBuilder without flattening it to a byte[]
foreach (Blob blob in blobBuilder.GetBlobs())
{
foreach (byte b in blob.GetBytes())
{
sigInOffset |= ((uint)b) << (8 * (3 - i));
i++;
}
}
// sigInOffsetEntries will be later sorted and appended to typeIndexToTokenMapBlob
sigInOffsetEntries.Add(new KeyValuePair<uint, uint>(typeIndex, sigInOffset));
}
else
{
typeIndexToTokenMapBlob.WriteDWORD(typeIndex);
typeIndexToTokenMapBlob.WriteDWORD(typeDataBlob.Size());
typeDataBlob.WriteBuffer(blobBuilder);
}
}
// sort sigInOffsetEntries based on sigInOffset
sigInOffsetEntries.Sort((KeyValuePair<uint, uint> left, KeyValuePair<uint, uint> right) =>
{
if (left.Value < right.Value)
return -1;
if (left.Value == right.Value)
return 0;
return 1;
});
// write the sorted sigInOffsetEntries
foreach (KeyValuePair<uint, uint> sigInOffsetEntry in sigInOffsetEntries)
{
typeIndexToTokenMapBlob.WriteDWORD(sigInOffsetEntry.Key);
typeIndexToTokenMapBlob.WriteDWORD(sigInOffsetEntry.Value);
}
// add typeDataBlob to the end of m_typeIndexToTokenMapBlob
typeIndexToTokenMapBlob.WriteBuffer(typeDataBlob.ToArray());
return typeIndexToTokenMapBlob;
}
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
// This node does not trigger generation of other nodes.
if (relocsOnly)
return new ObjectData(Array.Empty<byte>(), Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this });
DebugInfoBlob debugData = GetDebugTypeIndexToTokenMap(factory.WindowsDebugData.DebugPseudoAssemblySection.PseudoAssembly, factory.WindowsDebugData.UserDefinedTypeDescriptor.CompleteKnownTypes);
return new ObjectData(debugData.ToArray(), Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this });
}
protected override string GetName(NodeFactory context)
{
return "___DebugTypeSignatureMapSection";
}
}
}
|
